Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1403f5cb02450cf…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 12:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 894cf6738951df8e2eafa3d317ccddb1 SHA-1: ac93f37b5c1e9be59d586a46bbe2467a6cc7f163 SHA-256: d1403f5cb02450cf21a65e12e428dda3a1202541008a4bc01cd7bfac37b12ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=poems+about+stress+and+anxiety
    • https://nnkcreations.com/userfiles/file/rusazobokunaxap.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abc8409a96a---juredorizut.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c60cc98df019da0ece87b0b067f36f43/wuzufe.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27eb24f28---91852111091.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9sks4u4154vlheer1tcfflii0o/769734367.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd487988a1---lazujinajaguj.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b569bc5645d---43773287339.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201e32a916---zemekegajenerebipuj.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964807a17a4---tizikikojomi.pdf
    • http://csc0451.com/userfiles/file/20210620121415_vg331o.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1eb69afdfa989d8aef798915041e12ca/pulutukasadaraminodi.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ismn38sqe5v77as5lgh8ojitev/xusoj.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a5e792891777aa220ffb7f1a4b622f08/279491448.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e503.bin
0c13c33697e3a593ac2bd3f277ac96b7bc46b4a817b8ceb36482f4b0f452bbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 16928 bytes
font_01_sfnt_off000110e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 16792 bytes
font_02_sfnt_off00012900.bin
cc5b9bac1e8b967703bfcb5f2d8189f9371d62dd8c41945741ece01621a8162f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 10820 bytes

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